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  1. using System;
  2. using System.Windows.Forms;
  3. using System.Threading;
  4.  
  5. class MainForm : Form {
  6.   TextBox textBox;
  7.   Thread thread;
  8.   volatile bool abortRequest = false;
  9.   volatile bool activeBackground = false;
  10.   void DoBackgroundWork() {
  11.     activeBackground = true;
  12.     while (!abortRequest) {
  13.        Thread.Sleep(1000);
  14.        this.BeginInvoke(new EventHandler((sender, e) => { textBox.AppendText("."); }),
  15.          new object [] { this, EventArgs.Empty });
  16.     }
  17.     this.Invoke(new EventHandler((sender, e) => {
  18.         textBox.AppendText(Environment.NewLine + "UI同期が必要な終了処理");
  19.         activeBackground = false;
  20.         this.Close();
  21.        }), new object [] { this, EventArgs.Empty });
  22.   }
  23.   public MainForm() {
  24.     thread = new Thread(DoBackgroundWork);
  25.     textBox = new TextBox() { Multiline= true, Dock = DockStyle.Fill };
  26.     this.Controls.Add(textBox);
  27.     this.Load += (sender, e) => { thread.Start(); };
  28.     this.Closing += (sender, e) => {
  29.       if (activeBackground) { 
  30.         abortRequest = true;
  31.         e.Cancel = true;
  32.       }
  33.     };
  34.   }
  35. }
  36. class Program {
  37.  static void Main() {
  38.    Application.Run(new MainForm());
  39.  }
  40. }
  41.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cs(2,14): error CS0234: The type or namespace name `Windows' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(6,3): error CS0246: The type or namespace name `TextBox' could not be found. Are you missing a using directive or an assembly reference?
Compilation failed: 2 error(s), 0 warnings
stdout 
Standard output is empty
https://ideone.com/UQNof7
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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